.box{
    width: 290px;
    border: 1px solid #000;
    margin: 20px auto;
}
li{
    list-style: none;
}
span,
a{
    display: block;
    padding: 10px 0 10px 30px;
    position: relative;
    cursor: pointer;
}
span:after{
    position: absolute;
    content: "";
    width: 0;
    height: 0;
    border-left: 10px solid #C0C4CB;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    left: 10px;
    top: 50%;
    margin-top: -8px;
}
a{
    padding: 10px 0 10px 35px;
    color: #000;
    text-decoration: none;
}
a:before{
    position: absolute;
    content: "";
    width: 20px;
    height: 20px;
    background: orchid;
    border-radius: 50%;
    left: 10px;
    top: 50%;
    margin-top: -10px;
}
 
span:hover,
a:hover{
    background: #C4C4C4;
}
.act:after{
    border-left: 10px solid #1F1F1F;
}
.act_show:after{
    border-top: 10px solid #1F1F1F;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
}
.act1{
    background: #5C5C5C;
    color: #fff;
}
.hidden{
    display: none;
}
.show{
    display: block;
}
